#ifndef __UDP_SERVER_HPP__

#define __UDP_SERVER_HPP__

#include <iostream>
#include <string>
#include <memory>
#include <cstring>
#include <cerrno>
#include <strings.h>
#include <functional>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "InetAddr.hpp"
#include "Log.hpp"
#include "Common.hpp"

using namespace LogModule;

const static int gsockfd = -1;
// const static std::string gdefaultip = "127.0.0.1"; // 表示本地主机，本地通信用该ip绑定server
const static uint16_t gdefaultport = 8080;  //自行指定非特定的port，

using func_t = std::function<std::string(const std::string)>;

class UdpServer
{
public:
    UdpServer(func_t func, uint16_t port = gdefaultport)
        : _sockfd(gsockfd),
          _addr(port),          //call InetAddr(uint16_t port)
          _isrunning(false),
          _func(func) 
    {
    }

    void InitServer()
    {   //1.创建socket
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0); 
        if(_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket: "<<strerror(errno);
            Die(SOCKET_ERR);
        }

        //2.2 bind ： 设置进入内核之中
        int n = ::bind(_sockfd, _addr.NetAddr(), _addr.NetAddrLen());
        if(n < 0)
        {
            LOG(LogLevel::FATAL) << "bind: "<< strerror(errno);
            Die(BIND_ERR);
        }
        LOG(LogLevel::INFO) << "bind success";
    }
    void Start()
    {
        _isrunning = true;
        while(true)
        {
            char inbuffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            ssize_t n = ::recvfrom(_sockfd, inbuffer, sizeof(inbuffer) - 1, 0, CONV(&peer), &len);
            if(n > 0)
            {
                inbuffer[n] = 0;
                std::string result = _func(inbuffer);
                ::sendto(_sockfd, result.c_str(), result.size(), 0, CONV(&peer), sizeof(peer));//TODO..
            }

        }
        _isrunning = false;
    }
    ~UdpServer()
    {
        if(_sockfd > gsockfd)
            ::close(_sockfd);
    }


private:
    int _sockfd;
    InetAddr _addr;
    bool _isrunning;

    func_t _func;   //业务，回调
};

#endif